Blueair pre-filter in Lunar Rock for the Blue Pure 411+ air purifier. Form meets function in Blue Pure 411+'s colorful pre-filters. The stretchy fabric allows you to customize the color to match your style, as well as extend the life of the primary filter, catching large airborne particles such as dust, lint, pollen, and pet hair. Vacuum the exterior of the fabric pre-filter to remove visible dust and dirt as often as you'd like. Removable, washable, and reusable the pre-filter is designed to be used again and again. When it requires a deeper clean, throw the fabric in the washing machine on a gentle, low-temperature cycle. Hang to dry. Six pre-filter colors are available for the Blue Pure 411+ air purifier; Diva Blue, Buff Yellow, Crystal Pink, Lunar Rock, Dark Shadow and Saffron Red. Pre-filter in Dark Shadow color comes standard! Blueair Blue Pure 411+ Lunar Rock Pre-filter in Gray | ABLA411PLUSCLOTHLR